Bone-seeking technetium-99m complex

ABSTRACT

A bone-seeking, technetium-99m-tin-phosphonate complex effective as a skeletal-imaging agent has been found particularly useful for diagnostic purposes. Skeletal tissue concentrations of technetium-99m obtained with the complex compare favorably to other bone-seeking radionuclides.

BACKGROUND OF THE INVENTION

This is a continuation-in-part application of our prior U.S. application Ser. No. 263,171, filed June 15, 1972, now abandoned.

This invention relates to a bone-seeking complex of technetium-99m.

Efforts to find a better gamma-emitting radionuclide for skeletal imaging to replace the long-lived nuclide strontium 85 (half-life 65 days) or inconveniently short-lived fluorine-18 (half-life 1.83 hours) have thus far been restricted mostly to the investigation of radioactive divalent alkaline earth cations, and the trivalent cations of gallium and the lanthanons. The excellent physical characteristics (half-life of 6 hours and monoenergetic gamma emission of 140 KeV with an external photon yield of 90%) of the readily available radionuclide technetium-99m are well-known. By virtue of its optimum half-life and absence of beta emission, technetium- 99m can be administered in relatively large doses (10-15 mCi) without exceeding reasonable radiation levels. Until recently, technetium-99m has been used extensively in radioisotopic imaging procedures for almost every major organ in man with the exception of the skeleton.

In our copending application, Ser. No. 195,034 (filed Nov. 2, 1971) there is disclosed a metabolizable, bone-seeking composition comprising a technetium-99m-tin-polyphosphate complex prepared from a polyphosphate having a molecular weight above 300, preferably above 1400.

It was discovered that when solutions of technetium-99m-tin-polyphosphate complex are given intravenously, technetium-99m localizes to a great extent in bone, particularly in diseased or abnormal areas of the skeleton. Excellent visualization of both normal bone and skeletal lesions is observed about 2 hours after administration of the complex. Normal and abnormal skeletal tissue are readily delineated using conventional radioisotope imaging devices such as rectilinear scanners or scintillation cameras.

It is an object of the invention to provide technetium-99m in additional bone-seeking forms suitable for use as skeletal-imaging agents.

SUMMARY OF THE INVENTION

The present invention is predicated on the discovery that when solutions of technetium-99m-tin-organodiphosphonate complexes are administered intravenously, technetium-99m localizes to a great extent in bone, particularly in diseased or abnormal areas of the skeleton. The presence of technetium-99m provides excellent visualization of both normal bone and skeletal lesions within about 2 hours after administration of the complex employing conventional radioisotope imaging devices such as rectilinear scanners or scintillation cameras.

DETAILED DESCRIPTION OF THE INVENTION

It has been reported that various diphosphonates exhibit the same inhibitory effect on calcification as polyphosphates at molar concentrations as low as 10.sup.⁻⁷ to 10.sup.⁻⁶. They have also been found to posses an affinity for hydroxyapatite crystals similar to that of polyphosphates. Diphosphonates have also been utilized in the treatment of osteoporosis. The following literature references report most of the work to date in the area of the administration of phosphonates to animals. [R. G. G. Russell et al, Calc. Tiss. Res., Vol. 6, pp. 183-196 (1970); M. E. Cabanela et al, Calc. Tiss. Res., Vol. 8, pp. 114-120 (1971); J. Jowsey et al, J. Lab. Clin. Med., Vol. 78, pp. 574-584 (1971); H. A. Fleisch et al, Europ. J. Clin. Invest., Vol. 1, pp. 12-18 (1970); R. G. G. Russell, Arch. Intern, Med., Vol. 124, pp. 571-577 (1969); M. D. Francis, Calc. Tiss. Res., Vol. 3, pp. 151-162 (1969); J. Jowsey et al, J. Lab. Clin. Med., Vol. 76, pp. 126-133 (1970); G. A. Nolen et al, Toxicology and App. Pharm., Vol. 18, pp. 548-561 (1971); and W. R. King et al, Clin. Orthop., Vol. 78, pp. 251-270 (1971)].

The diphosphonates employed in the practice of the invention are completely stable in vivo against chemical hydrolysis or hydrolysis by phosphatase enzymes thereby enhancing their value as a bone-seeking component in the composition and method of the invention.

The present invention is related to a bone-seeking composition comprising a technetium-99m-tin-organo-diphosphonate complex. The present invention also contemplates methods for making the aforesaid complex, aqueous solutions containing the complex and methods for using the complex as a boneseeking agent for skeletal-imaging.

Technetium-99m is commercially available either from an isotope generator as a daughter product of molybdenum99 or as a direct product from a commercial supplier. It is also available as a solvent extraction product from molybdenum99 solutions generally as alkali metal pertechnetate solutions at 5-100 mCi. A further discussion of preparative methods appears in U.S. Pat. Nos. 3,468,808 and 3,382,152.

Commercially available stannous salts, both hydrate and anhydrous, may be used as the tin source. Most readily available are stannous chloride, sulfate and acetate.

Suitable diphosphonates for forming the complexes of the present invention are well-known in the prior art. They and methods for their production are described in the above-noted publications and in Dutch Application No. 6,604,219 (Quimbly et al., 1966). They may be utilized in the practice of the invention either as the free acid or as a non-toxic, pharmaceutically acceptable salt with a suitable cation such as sodium.

The preferred compounds are 1-hydroxy-ethane-1,1-diphosphoric, methylene diphosphonic, dichloromethylene diphosphonic, 1-amino-ethane-1,1-diphosphonic acids or their salts. The compounds formed by the polycondensation of the aforesaid compounds may also be utilized. The most preferred compound is methylene diphosphonic acid or its salts.

Suitable cations for forming the salts include sodium, potassium, magnesium, cesium, calcium, barium and iron. It is to be understood, however, that any non-toxic salt forming cation may be used.

The composition of the invention is most conveniently provided as a sterile kit consisting of non-radioactive chemicals for mixing with pertechnetate prior to use. The kit contains stannous salt solution, phosphonate solution, alkaline and/or buffer solution, or combinations of these. Using sterile pyrogen free water and reagents and using ascetic techniques, these solutions would be mixed with each other and then with the pertechnetate solution. The particular order of mixing does not appear to be critical. Thus, the stannous salt could be added to the pertechenate solution and the mixture combined with the phosphonate solution. Alternatively, the phosphonate could be combined with the pertechnetate prior to the addition of the stannous salt or combined with the stannous salt and admixed with the pertechnetate.

One such kit involving the single step of adding pertechnetate to the other materials is prepared as follows:

EXAMPLE 1

750 Mg of 1-hydroxyethane-1,1-diphosphonate (EHDP) and 50 mg of stannous chloride (SnCl₂ -- 2H₂ O) (0.1 ml of 500 mg/ml of 5NHCl, freshly prepared) were dissolved in 30 ml of water. The pH was adjusted to 7.5 and the volume brought up to 50 ml. 2 Ml aliquots were pipetted into 20 vials and lyopholized overnight in conventional freeze-drying apparatus. Each of these "kits" contained 2 mg of SnCl₂ -- 2H₂ O and 30 mg of DHDP (as acid). The complex was prepared by adding 4-6 ml (5-15 mc) of 99m_(Tc) as sodium pertechnetate to each of the vials and mixing well. The solutions were sterilized by passage through a 0.22 size membrane filter. The final pH ranged from 6.8 to 7.2. The solutions are now ready for intravenous injection.

The complexes of the invention were utilized as skeletal imaging agents in accordance with the following procedure.

EXAMPLE 2

Adult New Zealand albino rabbits having an average weight of 3.8 kg were utilized. Strontium-85 was employed as a standard for comparison. In a typical experiment 20-250 μCi (i.e., containing approximately 1 mg/kg as the free acid of body weight) of 99m_(Tc) EHDP were injected intravenously into the rabbits through the marginal ear vein and compared with 10-20 μ Ci 85 .sub. Sr chloride administered simutaneously. Each dosage is contained in a volume of 1 ml.

The animals were sacrificed serially from 1 to 24 hours after injection and the activities in major organs were determined by counting multiple samples from each organ in a scintillation well counter (the technetium-99m counts were corrected for the Compton contributions from the strontium-85 activity in the technetium-99m energy window). Multiple samples were counted from the tibia, femur, spine and pelvic bones; the total activity in the skeleton was estimated by assuming the whole skeleton consisted of equal proportions by weight of tibia, spine, femur and pelvis and that the skeletal mass was 10% of the body weight. The red marrow was sampled from the femur and the total marrow was assumed to be 2.2% of the total body weight. Similarly, blood volume was assumed to be 7% and the skeletal muscle 43% of the body weight. The whole liver and both kidneys were weighed and multiple samples from each were counted to measure the total activity in each organ.

In another series of experiments carried out as described above, localization of technetium from its tin-phosphonate complex was determined in the callous of three week-old fractures of tibia in albino rabbits, again in comparison with strontium-85. Comparative radioassay of technetium-99m administered as the pertechnetate was measured in the callous of tibial fractures in rabbits at one and four hours after administration. The results are set forth in Table 1.

                                      TABLE 1                                      __________________________________________________________________________     DISTRIBUTION OF .sup.99m Tc-EHDP and .sup.85 Sr IN RABBITS                     SIMULTANEOUS STUDY (6 EACH)                                                    % dose in whole organ                                                                    1 Hr     2 Hrs    4 Hrs    24 Hrs                                    __________________________________________________________________________     ORGAN     .sup.99m Tc                                                                         .sup.85 Sr                                                                         .sup.99m Tc                                                                         .sup.85 Sr                                                                         .sup.99m Tc                                                                         .sup.85 Sr                                                                         .sup.99m Tc                                                                         .sup.85 Sr                           __________________________________________________________________________     Blood*    8.61 11.9                                                                               2.58 7.08                                                                               0.89 3.85                                                                               0.49 0.29                                 Liver     0.80 1.57                                                                               0.42 0.98                                                                               0.28 0.62                                                                               0.43 0.04                                 Muscle**  6.46 13.4                                                                               1.82 8.8 1.25 6.46                                                                               0.87 1.00                                 Kidneys   2.40 0.80                                                                               1.22 0.64                                                                               0.94 0.34                                                                               0.63 0.03                                 Marrow.sup.+                                                                             0.70 0.91                                                                               0.38 0.76                                                                               0.83 0.50                                                                               0.42 0.10                                 One femur 0.82 1.04                                                                               0.84 1.21                                                                               0.81 1.25                                                                               0.76 0.93                                 Bone(Avg).sup.+.sup.+                                                                    46.6 56.0                                                                               48.2 49.4                                                                               47.4 68.1                                                                               41.5 51.9                                 Urine     30.9 6.96                                                                               51.8 18.0                                                                               53.4 22.7                                                                               --   --                                   __________________________________________________________________________     % dose / 1 % body weight                                                       __________________________________________________________________________     Blood     1.23 1.70                                                                               0.37 1.01                                                                               0.13 0.55                                                                               0.07 0.04                                 Liver     0.30 0.59                                                                               0.18 0.43                                                                               0.11 0.26                                                                               0.28 0.02                                 Muscle    0.15 0.31                                                                               0.04 0.21                                                                               0.03 0.15                                                                               0.02 0.02                                 Kidneys   3.93 1.75                                                                               2.72 1.40                                                                               1.95 0.71                                                                               1.29 0.06                                 Marrow    0.36 0.41                                                                               0.17 0.34                                                                               0.38 0.23                                                                               0.19 0.05                                 Bone(Avg) 4.66 5.60                                                                               4.82 6.44                                                                               4.74 6.81                                                                               4.14 5.21                                 Femur     3.85 4.90                                                                               3.94 5.74                                                                               3.86 6.17                                                                               3.42 4.83                                 Tibia     2.17 3.62                                                                               2.49 4.73                                                                               2.16 5.13                                                                               2.10 4.27                                 Pelvis    7.15 7.07                                                                               7.40 7.70                                                                               7.41 8.02                                                                               5.70 5.26                                 Spine     5.87 7.03                                                                               5.44 7.59                                                                               5.52 7.82                                                                               5.30 6.47                                 Callus    24.7 31.2                                                                               --   --  28.9 37.7                                                                               --   --                                   __________________________________________________________________________     RATIOS                                                                         __________________________________________________________________________     Bone/Blood                                                                               4.3  3.4 14   6.4 38   13  81   134                                  Bone/Marrow                                                                              14   14  28   19  27   32  29   119                                  Bone/Muscle                                                                              35   19  123  32  196  47  292  227                                  Callus/Blood                                                                             20   18  --   --  225  81                                            Callus/N. Tibia                                                                          11   9   --   --  12   8                                             Callus/N. Femur                                                                          7    7   --   --  7    7                                             __________________________________________________________________________       *7 % of body weight                                                           **43 % of body weight                                                           .sup.+2.2 % of body weight                                                    .sup.+.sup.+10 % of body weight                                          

As is apparent from Table 1, the soft tissue and blood concentrations of the 99m_(Tc) EHDP at various times were much lower than those for 85.sub. Sr whereas the skeletal concentrations were similar. The cumulative urinary excretion for 99m_(Tc) EHDP was at least 3 times higher than for 85.sub. Sr. The concentration of the 99m_(Tc) compound in he callous was somewhat lower than that of 85.sub. Sr ; however, the callous normal bone concentration ratios were similar.

Imaging of the skeleton of albino rabbits with 3 weel old tibial fracturs after injection with the complexes of the invention as described in Example 2 was performed using a scintillation camera (Nuclear Chicago Pho-Gamma HP Camera with high sensitivity collinator for 99m_(Tc)). Camera images of the entire body were obtained in three exposures and demonstrated the localization of Tc-99m in the callous of the fracture at 1, 2, 4 and 24 hours. The test demonstrated that very good skeletal images can be obtained any time beyond 2 hours after injection.

A total body scan of a normal dog after injection with the complexes of the invention as described in Example 2 utilizing a rectilinear scanner (OHio-Nuclear Model 84-D Scanner) was obtained 2 hours after injection at the 99m_(Tc) EHDP complex.

EXAMPLE 3

In another series of experiments carried out as described in Example 2, the distribution of technetium 99m from its 99m-technetium-tin-methylene diphosphonate complex was determined in albino rabbits, again in comparison with strontium-85. Comparative radioassay of technetium 99m were measured after 2 hours at the dosages indicated in Table 2. The results are set forth in Tables 2 and 3.

                                      TABLE 2                                      __________________________________________________________________________     CARRIER EFFECT OF MDP ON .sup.99m TcMDP and .sup.85 Sr                         IN RABBITS, 2 Hrs.                                                             (6 each)                                                                       0.01 mg/kg      0.05 mg/kg                                                                             0.1 mg/kg                                                                              0.5 mg/kg                                      __________________________________________________________________________     Organ .sup.99m Tc                                                                         .sup.85 Sr                                                                          .sup.99m Tc                                                                        .sup.85 Sr                                                                         .sup.99m Tc                                                                        .sup.85 Sr                                                                         .sup.99m Tc                                                                        .sup.85 Sr                                 __________________________________________________________________________     % Dose in Whole Organ                                                          __________________________________________________________________________     Blood 1.12 3.27 0.92                                                                               3.66                                                                               0.91                                                                               3.95                                                                               0.83                                                                               3.11                                       Liver 0.45 0.65 0.36                                                                               0.71                                                                               0.37                                                                               1.05                                                                               2.41                                                                               0.69                                       Kidneys                                                                              1.24 0.34 2.58                                                                               0.46                                                                               1.70                                                                               0.66                                                                               0.99                                                                               0.45                                       Marrow                                                                               0.31 0.53 0.34                                                                               0.53                                                                               0.28                                                                               0.57                                                                               1.32                                                                               0.67                                       One Femur                                                                            2.45 3.46 2.35                                                                               2.53                                                                               2.46                                                                               2.80                                                                               2.35                                                                               2.96                                       Muscle                                                                               0.93 5.69 1.15                                                                               5.89                                                                               1.53                                                                               9.32                                                                               2.03                                                                               5.65                                       Urine 43.6 10.3 40.5                                                                               23.16                                                                              43.5                                                                               15.4                                                                               41.1                                                                               15.16                                      __________________________________________________________________________     % Dose/1 % - body weight                                                       __________________________________________________________________________     Blood 0.16 0.47 0.13                                                                               0.52                                                                               0.13                                                                               0.56                                                                               0.12                                                                               0.45                                       Liver 0.11 0.16 0.11                                                                               0.22                                                                               0.11                                                                               0.30                                                                               0.76                                                                               0.23                                       Kidneys                                                                              2.08 0.54 5.39                                                                               0.9 2.43                                                                               1.00                                                                               1.53                                                                               0.69                                       Marrow                                                                               0.14 0.24 0.16                                                                               0.24                                                                               0.13                                                                               0.26                                                                               0.60                                                                               0.30                                       Femur 9.87 13.93                                                                               8.24                                                                               9.10                                                                               8.77                                                                               10.0                                                                               9.58                                                                               11.32                                      Tibia 4.03 7.14 3.76                                                                               4.94                                                                               4.06                                                                               6.05                                                                               4.18                                                                               6.16                                       Pelvis                                                                               10.71                                                                               13.55                                                                               9.09                                                                               8.33                                                                               13.0                                                                               12.2                                                                               7.47                                                                               8.68                                       Spine 9.17 12.78                                                                               6.39                                                                               6.75                                                                               7.44                                                                               8.45                                                                               7.51                                                                               8.92                                       Muscle                                                                               0.02 0.13 0.03                                                                               0.14                                                                               0.03                                                                               0.22                                                                               0.05                                                                               0.13                                       Ave Bone                                                                             8.45 11.85                                                                               6.87                                                                               7.29                                                                               8.32                                                                               9.17                                                                               7.19                                                                               8.77                                       __________________________________________________________________________     .sup.99m Tc/.sup.85 Sr                                                                 0.713    0.942    0.907 0.820                                          __________________________________________________________________________

                  TABLE 3                                                          ______________________________________                                         Ratio of .sup.99m TcMDP/.sup.85 Sr                                             Organ   0.01 mg/kg                                                                               0.05 mg/kg                                                                               0.1 mg/kg                                                                              0.5 mg/kg                                  ______________________________________                                         Blood   0.342     0.254     0.229   0.279                                      Liver   0.708     0.519     0.395   3.48                                       Kidneys 3.87      5.64      2.34    2.25                                       Marrow  0.576     0.648     0.519   2.51                                       Femur   0.709     0.963     0.922   0.866                                      Tibia   0.564     0.812     0.716   0.640                                      Pelvis  0.791     1.19      1.08    0.861                                      Spine   0.718     0.955     0.915   0.855                                      Muscle  0.159     0.193     0.150   0.401                                      Ave Bone                                                                               0.714     1.01      0.941   0.831                                      ______________________________________                                    

EXAMPLE 4

The distribution of technetium 99m from its 99m technetium-tin-1-amino-ethane-1,1-diphosphonate complex was determined as in Example 3 and compared with the distribution of strontium-85. The dosages and results are set forth in Tables 4 and 5 below.

                                      TABLE 4                                      __________________________________________________________________________     DISTRIBUTION OF .sup.99m Tc-Sn-AEDP and .sup.85 Sr IN RABBITS (6 each)         2 Hrs. Carrier Effect on AEDP                                                  0.01 mg/kg      0.05 mg/kg                                                                               0.1 mg/kg 0.5 mg/kg                                  __________________________________________________________________________     Organ .sup.99m Tc                                                                         .sup.85 Sr                                                                          .sup.99m Tc                                                                         .sup.85 Sr                                                                          .sup.99m Tc                                                                         .sup.85 Sr                                                                          .sup.99m Tc                                                                         .sup.85 Sr                            __________________________________________________________________________     % Dose in Whole Organ                                                          __________________________________________________________________________     Blood 1.18 2.99 1.01 2.50 0.96 2.48 1.38 4.36                                  Liver 1.69 0.568                                                                               0.806                                                                               0.613                                                                               0.309                                                                               0.654                                                                               0.216                                                                               0.720                                 Kidneys                                                                              1.59 0.329                                                                               1.13 0.353                                                                               0.913                                                                               0.324                                                                               1.11 0.384                                 Marrow                                                                               0.657                                                                               0.465                                                                               0.549                                                                               0.486                                                                               0.211                                                                               0.244                                                                               0.23 0.456                                 W. Femur                                                                             2.34 3.22 2.41 3.51 2.38 3.27 1.74 2.75                                  W. Tibia                                                                             1.96 2.71 2.14 3.15 2.18 2.99 1.55 2.42                                  Muscle                                                                               0.988                                                                               4.98 1.20 5.09 1.46 5.15 0.883                                                                               6.51                                  Urine 48.39                                                                               20.97                                                                               44.21                                                                               11.95                                                                               38.8 12.1 48.85                                                                               10.47                                 __________________________________________________________________________     % Dose/1 % Body weight                                                         __________________________________________________________________________     Blood 0.168                                                                               0.427                                                                               0.144                                                                               0.357                                                                               0.137                                                                               0.354                                                                               0.197                                                                               0.624                                 Liver 0.617                                                                               0.177                                                                               0.176                                                                               0.134                                                                               0.083                                                                               0.182                                                                               0.079                                                                               0.270                                 Kidneys                                                                              2.72 0.567                                                                               1.83 0.551                                                                               1.28 0.441                                                                               2.11 0.924                                 Marrow                                                                               0.300                                                                               0.211                                                                               0.250                                                                               0.221                                                                               0.096                                                                               0.166                                                                               0.104                                                                               0.207                                 Femur 7.54 10.38                                                                               8.63 12.62                                                                               7.93 10.97                                                                               6.59 10.43                                 Tibia 8.13 11.28                                                                               9.30 13.69                                                                               8.50 11.71                                                                               7.27 11.37                                 Pelvis                                                                               8.53 10.66                                                                               7.82 11.44                                                                               6.24 8.66 7.93 11.42                                 Spine 6.20 8.98 7.80 11.60                                                                               7.36 10.56                                                                               6.05 9.87                                  Bone Ave                                                                             7.60 10.33                                                                               8.39 12.34                                                                               7.51 10.48                                                                               6.96 10.78                                 Muscle                                                                               0.037                                                                               0.116                                                                               0.028                                                                               0.118                                                                               0.034                                                                               0.136                                                                               0.021                                                                               0.151                                 __________________________________________________________________________     Tc/Sr   0.736     0.680     0.717     0.645                                    __________________________________________________________________________

                  TABLE 5                                                          ______________________________________                                         Ratio of .sup.99m Tc/.sup.85 Sr                                                Organ   0.01 mg/kg                                                                               0.05 mg/kg                                                                               0.1 mg/kg                                                                              0.5 mg/kg                                  ______________________________________                                         Blood   0.406     0.409     0.409   0.280                                      Liver   3.00      1.32      0.490   0.459                                      Kidney  4.99      3.30      2.94    2.47                                       Marrow  1.27      1.18      0.621   0.500                                      Femur   0.720     0.687     0.714   0.628                                      Tibia   0.710     0.681     0.721   0.632                                      Pelvis  0.794     0.684     0.725   0.692                                      Spine   0.689     0.675     0.705   0.614                                      Ave Bone                                                                               0.735     0.683     0.716   0.644                                      Muscle  0.338     0.236     0.205   0.140                                      ______________________________________                                    

EXAMPLE 5

Another set of experiments were carried out according to the method of Example 2 but varying the dosages as in Examples 3 and 4. The distribution of technetium 99m from its tin-1-hydroxy-ethane-1,1-diphosphonate after 2 hours was determined and compared with the distribution of strontium 85 from equivalent dosages. The dosages and results are set forth in Tables 6 and 7 below.

                                      TABLE 6                                      __________________________________________________________________________     DISTRIBUTION OF .sup.99m Tc-Sn-EHDP and .sup.85 Sr IN RABBITS (6 each)         Carrier Effect of EHDP, 2 Hrs.                                                        0.01 mg/kg                                                                               0.05 mg/kg                                                                               0.1 mg/kg 0.5 mg/kg                                 __________________________________________________________________________     Organ  .sup.99m Tc                                                                         .sup.85 Sr                                                                          .sup.99m Tc                                                                         .sup.85 Sr                                                                          .sup.99m Tc                                                                         .sup.85 Sr                                                                          .sup.99m Tc                                                                         .sup.85 Sr                           __________________________________________________________________________     % Dose in Whole Organ                                                          __________________________________________________________________________     Blood  0.99 3.19 1.35 3.39 1.02 3.10 1.503                                                                               4.43                                 Liver  0.53 0.74 1.61 0.77 0.19 0.64 0.260                                                                               0.76                                 Kidneys                                                                               0.81 0.43 2.9  0.46 0.63 0.30 1.10 0.48                                 Marrow 0.34 0.42 0.78 0.61 0.20 0.43 0.19 0.34                                 One Femur                                                                             2.20 2.83 2.44 3.33 2.82 3.42 1.75 2.48                                 One Tibia                                                                             2.05 2.60 2.22 3.04 2.44 2.98 1.43 2.07                                 Muscle 0.78 5.78 1.33 6.64 0.98 5.0  1.22 7.23                                 Urine  46.7 23.66                                                                               37.3 13.4 30.4 11.31                                                                               55.37                                                                               19.6                                 __________________________________________________________________________     % Dose/1 % - body weight                                                       __________________________________________________________________________     Blood  0.142                                                                               0.456                                                                               0.193                                                                               0.485                                                                               0.146                                                                               0.443                                                                               0.215                                                                               0.633                                Liver  0.154                                                                               0.206                                                                               0.432                                                                               0.210                                                                               0.068                                                                               0.230                                                                               0.086                                                                               0.244                                Kidney 1.55 0.655                                                                               3.83 0.616                                                                               1.09 0.513                                                                               2.23 0.972                                Marrow 0.152                                                                               0.192                                                                               0.353                                                                               0.291                                                                               0.093                                                                               0.195                                                                               0.088                                                                               0.152                                Femur  7.49 9.70 8.38 11.51                                                                               8.97 10.9 6.487                                                                               9.213                                Tibia  8.22 10.47                                                                               8.68 11.93                                                                               9.63 11.89                                                                               6.639                                                                               9.02                                 Pelvis 7.57 9.06 8.25 10.50                                                                               12.10                                                                               13.62                                                                               7.38 9.44                                 Spine  6.17 8.39 6.51 9.13 8.18 10.75                                                                               5.885                                                                               8.69                                 Muscle 0.018                                                                               0.135                                                                               0.031                                                                               0.154                                                                               0.023                                                                               0.116                                                                               0.028                                                                               0.168                                Ave Bone                                                                              7.36 9.41 7.96 10.77                                                                               9.73 11.8 6.60 9.09                                 __________________________________________________________________________     Tc/Sr   0.799     0.748     0.834     0.726                                    __________________________________________________________________________

                  TABLE 7                                                          ______________________________________                                         Ratio of .sup.99m Tc/.sup.85 Sr                                                       EHDP Dose                                                               ______________________________________                                         Organ    0.01 mg/kg                                                                               0.05 mg/kg                                                                               0.1 mg/kg                                                                              0.5 mg/kg                                 ______________________________________                                         Blood    0.309     0.391     0.329   0.339                                     Liver    0.724     2.26      0.302   0.354                                     Kidney   2.34      6.14      2.13    2.35                                      Marrow   0.780     1.33      0.478   0.579                                     Femur    0.786     0.734     0.834   0.705                                     Tibia    0.803     0.730     0.827   0.750                                     Pelvis   0.851     0.806     0.892   0.770                                     Spine    0.758     0.722     0.773   0.674                                     Ave Bone 0.799     0.748     0.834   0.726                                     Muscle   0.133     0.195     0.189   0.169                                     ______________________________________                                    

In all of the above examples, the dosages are based on the weight of the free diphosphonic acid employed to prepare the complex.

The complexes of the present invention are extremely useful for skeletal imaging. They combine the advantages of rapid blood clearance, relatively low soft tissue concentrations and a high degree of in vivo stability against enzymatic and chemical hydrolysis.

Generally, solutions for intravenous administration containing the complexes of the present invention may be prepared with 1-5 ml of ^(99M) Tc solutions containing 5-100 mCi of activity and can be administered to patients, preferably in a volume of 1-5 ml containing 5-20 mCi of radioactivity.

The dosage administered may range from about 0.01 to about 0.5 mg of complex per kg of body weight, preferably from about 0.01 to 0.02 mg of complex per kg of body weight, based on the weight of the free diphosphonic acid. 

What is claimed is:
 1. A technetium-99m-tin-methylene diphosphonate complex useful as a bone-seeking skeletal-imaging agent.
 2. A technetium-99m-tin-1-aminoethane-1,1-diphosphonate useful as a bone-seeking skeletal-imaging agent.
 3. A method for making the complex of claim 1 which comprises mixing in aqueous solution a non-toxic stannous salt, methylene diphosphonic acid or a non-toxic salt thereof and a non-toxic technetium-99m containing pertechnetate salt.
 4. A method for making the complex of claim 2 which comprises mixing in aqueous solution a non-toxic stannous salt, 1-aminoethane-1,1-diphosphonic acid or a non-toxic salt thereof and a non-toxic technetium-99m containing pertechnetate salt. 